Pressure-gage



Pressure Gage. No. 31,721. Patented March 19,1851:

UNITED STATES PATENT QFFICE.

JOHN LEAVENS, OF BROOKLYN, NEW YORK.

PRESSURE-GAGE.

Specification of Letters Patent No. 31,721, dated March 19, 1861.

To all whom it may concern:

Be it known that I, JOHN LEAVENS, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Pressure-Gage; and I do hereby cleclare that the following'is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in which- Figure 1, represents a front elevation of my invention. Fig. 2, is a side elevation of the same.

Similar letters of reference in both views indicate corresponding parts.

To enable others skilled in the art to fully understand and use my invention 1 will proceed to describe its construction and operation with reference to the drawing.

The pipe A, which bears the elliptical ring B, screws into or connects with the water chamber of a hydraulic press in such a manner, that the water, is allowed to rise into said pipe and to act on a piston G. This piston is fitted air or water tight into the pipe A, and it moves up and down in the same, and its upper end is formed into a point a, which supports the elliptic spring D. Said spring is placed into the interior of the ring B, and it is retained in its place by the point at, below and by a set screw 1), above as plainly shown in Fig. 1, of the drawing. One end of the spring D, connects with a lever E, b means of a pivot c, and its other end is sllghtly bent in and a pin cl, which is fastened in said end, forms the support for the lever E, and retains the same in an inclined position. By referring to Fig. 1, of the drawing it will be noticed that if the spring is left in its normal state or that if no pressure is exerted on said spring the pivot c, is slightly above the pin (Z, and the lever E, is inclined downward, but if the spring is compressed by subjecting it to a certain pressure, the pin cl, will gradually rise and the lever E, is caused to sweep over a plate F, that is secured to the ring B, and which is intended to be marked with a certain scale indicating the pressure in pounds to the square inch. The outer end of the lever E, extends a little way beyond the plate F, and it is intended to connect by means of a suitable rod with the end of the safety valve-lever. This rod is so adjusted that if the lever E, rises to a certain point the lever of the safety valve is raised.

The tension of the spring D, can be adjusted to any desired degree by means of the set screw Z), and if the piston C, is now subjected to a certain pressure from the water in the hydraulic press, the lever E, will be caused to sweep up on the plate F, and on arriving at the proper point the safety valve will be released and an accumulation of pressure beyond a certain limit will be prevented.

This device is of the utmost Value for hydraulic presses, where the safety valves are liable to stick and where pressure increases so rapidly that the water chambers are liable to burst. With my attachment the pressure is not permitted to rise beyond a certain point, and as soon as it reaches this point, the safety valve is raised and the bursting of the water chamber is prevented.

core by Letters Patent, is,

Supporting the spring D and lever E within the-indicating ring B between the upper point of the valve C and the adjuster b when all of said parts are mounted upon the steam pipe A and otherwise constructed as herein shown and described for the purposes set forth.

JOHN LEAVENS.

.l/Vitnesses JAMES LAIRD,

C. W. COWTAN. 

